She knows she needs to herd the prey into a tight group... 雌虎鲸明白它需要将猎物驱赶到一起
He has provided for his herd, and in the process, 他为马群提供了水源 与此同时
he will have secured mating rights to the entire herd. 便拥有与群中所有母马交配的权利
and sometimes lead the herd to a water hole 有时她能把象群带领到
To herd their prey, the predators raise their huge dorsal fins. 旗鱼张开大大的背鳍来把猎物赶到一起
A herd can clear a patch of seagrass the size of a football pitch in a single day. 这群儒艮可以在一天内吃掉足球场般大小的海草
This herd contains calves, easier targets. 这一象群里有更容易下手的幼象